From c8ee70c96200548699a2d038a93208c5723f91e7 Mon Sep 17 00:00:00 2001
From: Jacques Lucke <jacques@blender.org>
Date: Sun, 25 Sep 2022 19:16:53 +0200
Subject: Geometry Nodes: decentralize implicit input definitions

Previously, all implicit inputs where stored in a centralized place.
Now the information which nodes have which implicit inputs is
stored in the nodes directly.
---
 source/blender/nodes/NOD_node_declaration.hh | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

(limited to 'source/blender/nodes/NOD_node_declaration.hh')

diff --git a/source/blender/nodes/NOD_node_declaration.hh b/source/blender/nodes/NOD_node_declaration.hh
index 42755b2e8dd..13f8af4ddf5 100644
--- a/source/blender/nodes/NOD_node_declaration.hh
+++ b/source/blender/nodes/NOD_node_declaration.hh
@@ -65,6 +65,8 @@ struct FieldInferencingInterface {
   Vector<OutputFieldDependency> outputs;
 };
 
+using ImplicitInputValueFn = std::function<void(const bNode &node, void *r_value)>;
+
 /**
  * Describes a single input or output socket. This is subclassed for different socket types.
  */
@@ -103,6 +105,10 @@ class SocketDeclaration {
   /** Utility method to make the socket available if there is a straightforward way to do so. */
   std::function<void(bNode &)> make_available_fn_;
 
+  /** Some input sockets can have non-trivial values in the case when they are unlinked. This
+   * callback computes the default input of a values in geometry nodes when nothing is linked. */
+  std::unique_ptr<ImplicitInputValueFn> implicit_input_fn_;
+
   friend NodeDeclarationBuilder;
   template<typename SocketDecl> friend class SocketDeclarationBuilder;
 
@@ -140,6 +146,11 @@ class SocketDeclaration {
   bool compositor_skip_realization() const;
   bool compositor_expects_single_value() const;
 
+  const ImplicitInputValueFn *implicit_input_fn() const
+  {
+    return implicit_input_fn_.get();
+  }
+
  protected:
   void set_common_flags(bNodeSocket &socket) const;
   bool matches_common_data(const bNodeSocket &socket) const;
@@ -225,10 +236,11 @@ class SocketDeclarationBuilder : public BaseSocketDeclarationBuilder {
   }
 
   /** The input supports a field and is a field by default when nothing is connected. */
-  Self &implicit_field()
+  Self &implicit_field(ImplicitInputValueFn fn)
   {
     this->hide_value();
     decl_->input_field_type_ = InputSocketFieldType::Implicit;
+    decl_->implicit_input_fn_ = std::make_unique<ImplicitInputValueFn>(std::move(fn));
     return *(Self *)this;
   }
 
@@ -348,6 +360,13 @@ class NodeDeclarationBuilder {
                                          eNodeSocketInOut in_out);
 };
 
+namespace implicit_field_inputs {
+void position(const bNode &node, void *r_value);
+void normal(const bNode &node, void *r_value);
+void index(const bNode &node, void *r_value);
+void id_or_index(const bNode &node, void *r_value);
+}  // namespace implicit_field_inputs
+
 /* -------------------------------------------------------------------- */
 /** \name #OutputFieldDependency Inline Methods
  * \{ */
-- 
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